LM2597

更新时间： 2024-11-14 22:55:43

品牌	Logo	应用领域
美国国家半导体 - NSC		转换器稳压器
页数	文件大小	规格书
34页	902K
描述
SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features

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LM2597 数据手册

December 2000

LM2597/LM2597HV

SIMPLE SWITCHER^®Power Converter 150 kHz 0.5A

Step-Down Voltage Regulator, with Features

The LM2597HV is for use in applications requiring and input

voltage up to 60V.

General Description

The LM2597/LM2597HV series of regulators are monolithic

integrated circuits that provide all the active functions for a

step-down (buck) switching regulator, capable of driving a

0.5A load with excellent line and load regulation. These

devices are available in fixed output voltages of 3.3V, 5V,

12V, and an adjustable output version, and are packaged in

an 8-lead DIP and an 8-lead surface mount package.

Features

n 3.3V, 5V, 12V, and adjustable output versions

n Adjustable version output voltage range, 1.2V to 37V

(57V for HV version) 4% max over line and load

conditions

n Guaranteed 0.5A output current

n Available in 8-pin surface mount and DIP-8 package

n Input voltage range up to 60V

n 150 kHz fixed frequency internal oscillator

n Shutdown /Soft-start

n Out of regulation error flag

n Error output delay

n Bias Supply Pin (V_BS) for internal circuitry improves

efficiency at high input voltages

n Low power standby mode, I_Qtypically 85 µA

n High Efficiency

This series of switching regulators is similar to the LM2594

series, with additional supervisory and performance features

added.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

†

compensation , improved line and load specifications,

fixed-frequency oscillator, Shutdown /Soft-start, error flag

delay and error flag output.

The LM2597/LM2597HV series operates at a switching fre-

quency of 150 kHz thus allowing smaller sized filter compo-

nents than what would be needed with lower frequency

switching regulators. Because of its high efficiency, the cop-

per traces on the printed circuit board are normally the only

heat sinking needed.

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

A standard series of inductors (both through hole and sur-

face mount types) are available from several different manu-

facturers optimized for use with the LM2597/LM2597HV se-

ries. This feature greatly simplifies the design of

switch-mode power supplies.

Applications

n Simple high-efficiency step-down (buck) regulator

n Efficient pre-regulator for linear regulators

n On-card switching regulators

Other features include a guaranteed 4% tolerance on out-

n Positive to Negative converter

put voltage under all conditions of input voltage and output

load conditions, and 15% on the oscillator frequency. Ex-

ternal shutdown is included, featuring typically 85 µA

standby current. Self protection features include a two stage

current limit for the output switch and an over temperature

shutdown for complete protection under fault conditions.

Typical Application (Fixed Output Voltage Versions)

DS012440-1

†

Patent Number 5,382,918.

SIMPLE SWITCHER^®and Switchers Made Simple are registered trademarks of National Semiconductor Corporation.

DS012440

www.national.com

12 3 4 5 6 7...34

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与LM2597相关器件

型号	品牌	获取价格	描述	数据表
LM2597-12	ETC	获取价格	SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator with Features(897
LM2597-12MDC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2597-12MWC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2597-3.3	ETC	获取价格	SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator with Features(897
LM2597-3.3MDA	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2597-3.3MWA	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2597-5.0	ETC	获取价格	SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator with Features(897
LM2597-5.0MWA	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2597-ADJMWC	NSC	获取价格	IC 1.4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2597HV	NSC	获取价格

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